<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>双飞翼布局</title>
    <style>
      .column {
        height: 200px;
        float: left;
        line-height:200px;
        text-align: center;
      }
      .center {
        background-color: grey;
        width: 100%;
      }
      /* 这里得有个wrap通过margin来预留空间，但是父级center没有预留空间 */
      .center-wrap {
        margin: 0 190px 0 190px;
      }
      .left {
        background-color: aqua;
        width: 190px;
        margin-left:-100%;
      }
      .right {
        width: 190px;
        background-color: bisque;
        margin-left: -190px; /*这里是因为center没有往右边预留空间，如果.right宽度为0还是会被放到center的后面，
        现在是要right盖在center-wrap的margin-right的区域上，因此直接让right往左边移动挤进center上就行了*/
      }
    </style>
  </head>
  <body>
    <div class="center column">
      <div class="center-wrap">this is center</div>
    </div>
    <div class="left column">this is left</div>
    <div class="right column">this is right</div>
  </body>
</html>
